diff --git a/runtime/indent/ada.vim b/runtime/indent/ada.vim
index 6c8ab05..582d033 100644
--- a/runtime/indent/ada.vim
+++ b/runtime/indent/ada.vim
@@ -16,6 +16,7 @@
 "		15.10.2006 MK Bram's suggestion for runtime integration
 "		05.11.2006 MK Bram suggested to save on spaces
 "		19.09.2007 NO g: missing before ada#Comment
+"		2022 April: b:undo_indent added by Doug Kearns
 "    Help Page: ft-vim-indent
 "------------------------------------------------------------------------------
 " ToDo:
@@ -35,6 +36,8 @@
 setlocal indentkeys-=0{,0}
 setlocal indentkeys+=0=~then,0=~end,0=~elsif,0=~when,0=~exception,0=~begin,0=~is,0=~record
 
+let b:undo_indent = "setl inde< indk<"
+
 " Only define the functions once.
 if exists("*GetAdaIndent")
    finish